Pile-rrivek



P. H.- MACKIE.

PILE DRIVER HAMMER. APPLICATIN FILED MAY22.1911.

Patented June 1919. n

i Leonesa. .y f

y PILE-DRvEHAr/IMR i To all 'LU/1.0m "it may concern.' Be it known that IyPn'rnnrHpMnonima citizen of the'United States, 'and resident of Maxwelton, Island county," Vashi'ngton,

have invented certain new and useful` Iniprovements in Pile-Driver Hammers, 'of which the following is a'speciication.V

'My invention relates to pile driverfham-- mers and consists Vof V`a hammer so ,con-y structed that a spring maybe interposed b etween the hammer and the hoisting line, through which spring the effort of raising the hammer is transmitted, whereby the strain upon the` line when starting the upward vmovement of thev hamnier'is reduced and, in consequence, thelife of the hoistingl line is increased.

The object of my invention is to provide a spring connection of this sort to thereby eliminate breakage of the line and sudden strains upon the hoisting machinery. n y

In the accompanying drawings Iv have shown my invention embodied in the form of construction which is now most preferred i by nie.

Figure 1 is a central vertical section through a hammer constructedin,accordance with my invention.

Fig. 2 is a transverse sec-tion taken on the line 2 2 of Fig. l. V a The hammer body l may be of. any desired or suitable type of construction, eX- c-ept as herein otherwise specificallypointed out. The hammer is provided with a bore 2 which extends from the upper end of the hammer downwardly. This bore is of considerable size. Within it isplaced a'coiled spring 3, which is necessarily of heavy construction in order to support the weight of the hammer and the strain caused by quickly starting the same. Beneath the spring` .3 is a piston disk 4. This pistondisk forms the member through `which compression is aps plied to the spring and may,rtherefore, be called a compression disk.

In the upper end of the bore 2 is placed a collar 5. This collar and thehammer, are provided with coperating meansfor securing the collar in placeso as to prevent its removal. This collar acts as a thrust support for the spring 3. Themeans adopted for securing the collar in place as herein shown, consist in providing the collar and the hammer with registering openings which are ada' ted to receive the locking key y6. The loc ting key may be secured against ac-g sp'eciacauonof Letters Patent. Patgne June 2a, 191g, Ap'piic'ain,ineairrayzz,isiv.semaine.Waisev l" A' 5:

- cidental removal as by the-use of set screw- 7 or in any other suitable manner.

-Theeonnection of the hoisting lline with the hammer through the spring, employs a tension member which is herein vshown as 'consisting ofthe U-bolt 8, the two sides' or Y arms'of-which pass through the collar, one

collarf enough to permit Vattachment of the hoisting line thereto.-

y y I. If'jit is desired', acushioning disk 9,*which `:may be of wood, is placed-at the eXtreme bottom of the bore and is engaged by the ends of the U-bolt 8. n Y

In operating a'pile driver7 it is customary for the engineer to catch the hammer and apply the lifting effort as quicklyl as possible yafter it has struck the pileon the downward This lifting effort applied movement. with Vconsiderable force and produces a heavy strain uponthe Vhoistingv yline as the momentum of the engine parts is added to the normal pull of the engine to overcome the inertia of the hammer.

Also, itY often happens that the friction clutch ofy the hoistingengine is applied a little too soon and the line is tightened before the downward drop .of the hammer has been entirely spent. For both ofY these reasons the hoistingpline is regularly sub- Jected to strains which are much above normal. For this reason the life of is short.

For these reasons it has been customary to employ a section ofManila cable of sufficient length to extend from the hammer to such a line the hoisting sheaves at the upper end of theV Y guides for the hammer. A Manila cable has, whennew, a certain spring or stretch' of the cable which is brought into play when excess sive strains are applied. However, the cable willV soon have all of this stretch taken out of itrand it' then does not act to compensate for these abnormal strains.Y Moreover, the price of Manila cable for the saine work is much above that of a wire cable.

` By employing thespring'as hereinv de.-

scribed, I canuse a wire cable extending from the hammer to the hoisting engine and avoid the damage which would otherwise be caused thereto by the excessive strains fre`V quently applied te suchV a line.` Its life Y wouldk thereforefbe much ektended andits Y cost be fis muchless-thanrthat ofV a Manila cable.. i Y.

' Thefuse of Vthe spring has certain' other incidental nadvantages. t Whenv the-"hoisting strain is released to permit the line to drop,

`the expansion iofthefspring VVwill act to.A

quickly start the-line running out,evenbe fore the hammer can getunder way. In consequence, the hammer, 4while falling, has less ydrag upon 4it causedjbythe' necessity of pulling out its "hoisting line and will therefore Y fall more rapidly, and strike harder.

Q Similarly, the action of the spring at the `beginning of Vthe upward or hoisting movement of the hammer, will accelerate the Y receiving bore extending downward fromits v starting `of the hammer. It is Vthus possible tooperaterat a somewhat higher rate and also to strike aharder blow..

. What lI claim as mylinvention:

l. A pile driverhammerhaving a piston `Gopies 'ofthris patent may be obtainedfor Vupper end, a piston-like diskittin'g said bore, Yalifting rod connected with the disk and extending out of the bore, a spring Vin said bore acting tohold the disk'down, a

collar'- litting the outer end of the bore and engaging the outer end ofthe spring, and meansffor locking thecollar. in place. Y

2. A pile driver hammer having a longi tudinally' extending springreceiving bore opening upwardly, a coiled spring 1n Vsaid bore, an abutment member engaging the upgaging the lower end of the spring, a U-bolt QeXtending downwardly within the spring and secured to said-piston disk and a holding key for the abutment member passing Vthrough 'said abutment member and between .the sides of the U-bolt.

Signed at Seattle, Washington, this 16th yday of Mayl9l7.

PETER H. MACKIE.

Aper end of said spring, a piston-like disk en- 

